My VF-2 doesn't say what the power requirement is, but I'd guess it to be around 5V like most things of that nature. The flash itself will have a capacitor like all flash units, it simply doesn't have a battery to charge the capacitor, as that power comes from the camera. So in theory it should be able to work, as long as the camera had the right firmware to recognise the flash and provide power. Unfortunately, Olympus doesn't have a record of providing firmware updates to older cameras and lenses. After a certain timeframe, they just work on newer gear. Mind you, I don't know for certain that it could be possible, but you would think that it was, as Olympus must have been thinking of these things well in advance when they designed the connectors.